nanog mailing list archives
Re: Are SW upgrades needed in MPLS core networks?
From: Petri Helenius <pete () he iki fi>
Date: Fri, 06 Feb 2004 21:40:09 +0200
Rubens Kuhl Jr. wrote:
I have the understanding that catalyst line uses 48 bit access. Wonder where they got that from :-)There is another factor at play here which is memory bandwidth at the lookup engine. If you have to look deeper into the packet than you can accomplish by using single spin trough the thing that fetches x bit wide words from the packet, you´ll effectively half your packet rate.Yes, that might explain the performance halving in some architetures (may be it's what happens with Sup 720, may be not), instead of longer lookup cycle.
So when forwarding to single end hosts, you might end up with one third of the performance of IPv4. However I have not confirmed this but you might want to bother your sales engineer.
I think they also put that in a public document, probably due to the fact that Cisco put theirs in first. I haven´t seen a document discussing structures either one uses for IPv6 but I have been told they are "different for performance reasons".Doing 8+1+1+1+1+... would seem wasteful for IPv6 with the current address allocation scheme, are you sure that´s what´s used for IPv6 too?I'm not. Juniper isn't very open about this matter, and I only got confirmation of that for IPv4.
Pete
Current thread:
- Re: Are SW upgrades needed in MPLS core networks?, (continued)
- Re: Are SW upgrades needed in MPLS core networks? Rubens Kuhl Jr. (Feb 06)
- Re: Are SW upgrades needed in MPLS core networks? Randy Bush (Feb 06)
- Re: Are SW upgrades needed in MPLS core networks? Rubens Kuhl Jr. (Feb 06)
- Re: Are SW upgrades needed in MPLS core networks? Richard A Steenbergen (Feb 06)
- Re: Are SW upgrades needed in MPLS core networks? Rubens Kuhl Jr. (Feb 06)
- Re: Are SW upgrades needed in MPLS core networks? Randy Bush (Feb 06)
- Re: Are SW upgrades needed in MPLS core networks? Andy Dills (Feb 06)
- Message not available
- Re: Are SW upgrades needed in MPLS core networks? Rubens Kuhl Jr. (Feb 06)
- Re: Are SW upgrades needed in MPLS core networks? Randy Bush (Feb 06)
- Re: Are SW upgrades needed in MPLS core networks? Petri Helenius (Feb 06)
- Re: Are SW upgrades needed in MPLS core networks? Rubens Kuhl Jr. (Feb 06)
- Re: Are SW upgrades needed in MPLS core networks? Petri Helenius (Feb 06)
- Re: Are SW upgrades needed in MPLS core networks? Richard A Steenbergen (Feb 06)
- Re: Are SW upgrades needed in MPLS core networks? Rubens Kuhl Jr. (Feb 06)
- Re: Are SW upgrades needed in MPLS core networks? Richard A Steenbergen (Feb 06)
- Re: Are SW upgrades needed in MPLS core networks? Rubens Kuhl Jr. (Feb 06)